I really think this is silk, although I have difficulties believing it because the price is so low. Yes, the material is thin and sheer, but I don’t mind that for a slip dress that I will wear underneath unlined dresses. I am a EU38, and bought the XXL. The slip has enough ‘ease’, it is not tight / figure hugging. One size smaller would also have been fine, probably. The length of the slip is fine, not at all too short as you might expect from Asian products. Even though the store needed a couple of days to ship the product (and informed me politely about this), the slip arrived only 12 days after I bought it. Wonderful!